Futures Calculator

A futures contract is a binding agreement to buy or sell something — a barrel of oil, an index, a bushel of wheat — at a set price on a future date. Unlike an option, it is an obligation, not a right, so its payoff is a straight line rather than a hockey stick. The feature that defines futures, though, is leverage. To open a position you post only a small fraction of its full value — the initial margin, often 5–10% — yet you gain or lose on the entire notional. That ratio of notional to margin IS your leverage: post 10% and you are levered 10×, so a 1% move in the underlying swings your margin by 10%. The simulator draws this as two lines on one chart: the steep return on your margin, and the gentle return the same cash would earn holding the underlying outright. The leveraged line is exactly `leverage`× steeper, and cranking the leverage slider fans it away from the flat baseline — leverage made visible. The danger lives in the same multiplier. Because your margin is a thin cushion, a small adverse move erases it: at 10× leverage a 10% move against you wipes out the entire deposit, and a margin call — a forced liquidation when your equity drops to the maintenance level — comes even sooner. Worse, on a fast gap the price can blow straight through your liquidation point, leaving you owing more than you ever put down. The durable lesson: leverage does not change the odds of being right about direction, it only amplifies the consequences. It rents you a bigger position for a small deposit, and the rent is paid in risk — which is why futures reward precise, well-margined bets and punish casual ones.

Free and interactive — no sign-up, nothing to install. Read the full lesson for the plain-language explanation.